Of course, everything I am about to say should be run by a doctor. If it is just filled with liquid, it is likely to be more painful than serious in the sense of infection or other damage. The heat will help with the painfulness. Also baths will help with the pain. When I have been in desperate straits, I tried massaging the spot to see if I could make it open up and drain. Once it drains, generally speaking you are OK (unless, of course, there is something else going on like an infection). Good luck, I know how much those hurt.
You might find the ovarian cancer website more helpful about ovarian cyst or tumor questions =) Usually when a cyst is larger than 5cm doctors may want to remove it. I have a dermoid tumor, last I heard was 2.3x2.0cms. Just think positive! Your cyst seems pretty small, most peoples cysts are measured in cm's or inches, not mm's. Best of luck!
thanks a lot guys...that helps.